That isn't a cal file for an iMM-6. Probably an iMM-6C.Dayton iMM-6
what s microphone?Here's mine
I don't know, but I also don't have a good way to measure it, which is why I specified which adapter I'm using.How do you know the USB jack adapter isn't changing the frequency response? I have a TRRS to USB A adapter (not Google) and mine definitely does affect the frequency response.